866668215340 has 24 divisors (see below), whose sum is σ = 1829149005600. Its totient is φ = 344925237888.

The previous prime is 866668215269. The next prime is 866668215353. The reversal of 866668215340 is 43512866668.

It is a super-2 number, since 2×866668215340² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108873937 + ... + 108881896.

It is an arithmetic number, because the mean of its divisors is an integer number (76214541900).

Almost surely, 2^866668215340 is an apocalyptic number.

It is an amenable number.

866668215340 is an abundant number, since it is smaller than the sum of its proper divisors (962480790260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866668215340 is a wasteful number, since it uses less digits than its factorization.

866668215340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217756041 (or 217756039 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 866668215340 in words is "eight hundred sixty-six billion, six hundred sixty-eight million, two hundred fifteen thousand, three hundred forty".